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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daca6b850043311c4ef3cc555bc2c9710f2a2cb05bd217ce0fb324ed8990972' 
  AND token = '9wF93/zWbes853OVxkiGOjLLduf/wh3ozaMpCloCFAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}